I have done both Ancestry and 23andme. No surprises, I am very British white, with a chunk of Ashkenazi mixed in. I have been able to find cousins on my dad's side that I am hoping can help me with his branch. I have only done the testing for ancestry, not health info.
On a different note, DNA sequencing is being done in many areas of medicine. I work in oncology research, and almost every clinical trial out there includes at the very least an option to donate blood or other DNA samples for biobanking and future research. Treatments may be determined by one's biomarkers. So, people donating their DNA in this way today may save your life in the future.